Add mean value and n-number to nvd3 boxplot - d3.js

Question

I am using nvd3 boxplot for my charts. Is there any option to have mean as an asterisk (*) on the boxplot? Can we also have the n value above the top whisker similar to the image below.
This issue has been posted here.
Thanks in advance.
Edit
I would like to add a mean value which I calculate from the data points and not just the center of the box plot. The computed mean may not be in the center of the box plot due to outliers.

Answer 1

You can achieve this by doing the following algorithm:
Get all the rectangles
Find the middle point
Create a text and put it in the above calculated center
Code snippet:
function makeMarkOnMean(){
d3.selectAll(".mean").remove();//remove all * mean markers
//get all the rectangles
d3.selectAll(".nv-boxplot-box")[0].forEach(function(r){
window.setTimeout(function(){
var x = parseFloat(d3.select(r).attr("x")) + d3.select(r).attr("width")/2 - 3; //x position of the star
var y = parseFloat(d3.select(r).attr("y")) + parseFloat(d3.select(r).attr("height"))/2+12;//y position of the star
//now make the star on the above x and y
d3.select(r.parentNode).append("text").attr("class", "mean").style("font-size", "x-large").text("*").style("fill", "red").attr("x",x).attr("y", y);
},500)
});
Working code here.